A 4 kg object is attached to a spring and will stretch the spring 9.8 cm by itself. A forcing function of the form F(t) = 13 cos (wt) is attached to the object and the system experiences resonance. The object is initially displaced 6.5 cm downward from its equilibrium position and given a velocity of 13 cm/sec upward. Assume there is no damping in the system and displacement and velocity are positive downward. Use g = 9.8 m/s². Keep the coefficients in your answer exact or round them off to at least five decimal places. a) What is the differential equation of the motion. y' + = = b) Solve the differential equation to find the displacement as a function of time (t). y(t) =

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